i shot a doe with a 7mm-08 this season, and i was a little worried how that particular round would do. it was only a 75 yrd shot, but i dropped her in her tracks. second off, ive been shooting accurately out to 300 yrds. you may already know this, but a 7mm-08 is a necked down 308, but ive always been a firm believer in the 308. my dad has an identical encore in a 308, and my 7mm-08 has a significantly less amount of recoil. with a little bit of practice, and depending on how big of a kid he is, this may be the perfect round for him. a 243 is also an excellent round, and i also know guys who give their son's 223's, me personally, i like the bigger bullet, but if your son is scared of the recoil, it may be a little big for him. when i first started hunting, i used a 30-06, but it was a little too much gun for me at first, and led to accuracy problems.